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MySQL 5.7 Reference Manual
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Excerpts from this Manual Using Symbolic Links with Disk Data Objects

The performance of an NDB Cluster that uses Disk Data storage can be greatly improved by separating the data node file system from any tablespace files (undo log files and data files), and placing these on different disks. In early versions of NDB Cluster, there was no direct support for this in NDB Cluster, and it was necessary to achieve this separation using symbolic links. NDB Cluster now supports the data node configuration parameters FileSystemPathDD, FileSystemPathDataFiles, and FileSystemPathUndoFiles, which make the use of symbolic links for this purpose unnecessary. For more information about these parameters, see Disk Data file system parameters.